Re: ATM Carbon vs. Glass fiber for tube

["Dave Pitou" <dpitou@ix.netcom.com>]

Bratislav Curcic wrote
 
> This would be a criminal waste of money and material. Stiffness comes
> from keepeng the layers APART, not bunching them together.
> Use lightweight cardboard tube as a filler and lay carbon on the outside
> and on the inside (2 on the outside and 1 on the inside is heaps). 
> It will be stiff as a rock. 
> 

Of course it would be a waste of money, but that was the point I was trying
to make. Cardboard isn't usually light weight but it would work fine if it
was 1/8" to 1/4" thick. In this type of application urethane foam or
honeycomb would be a lighter choice than cardboard. In general it's best to
try to balance the number and directions of plys on the inside and outside
of a part in order to prevent strange expansion, but with a circular tube 1
ply on the inside and 2 on the outside would be OK as long as you use
bidirectional cloth.

Dave